Updated Selection of Projectiles for the Grendel

[LRRPF52]

I had purposely left it off since it needs to be seated so deeply, but I just added it. There is no reason to use the 120gr AMAX since we have the 123gr AMAX, specifically meant for the Grendel, and with a higher BC. Same goes for the .260 Rem and larger cases now that the 123gr AMAX can do better, unless you have a ton of them lying around.